shubhamvishu commented on PR #15508:
URL: https://github.com/apache/lucene/pull/15508#issuecomment-3667003654
To expand on what exactly a Lucene user would look like on their end to
test/enable this :
- **Compile** the C code (default impl or custom)
```sh
// Linux/Unix
gcc -shared -O3 -march=native -funroll-loops -o /home/simd/libdotProduct.so
/home/apachelucene/lucene/misc/src/c/dotProduct.c
// macOS
gcc -shared -O3 -march=native -funroll-loops -o
/home/simd/libdotProduct.dylib /home/apachelucene/lucene/misc/src/c/dotProduct.c
// Windows
gcc -shared -O3 -march=native -funroll-loops -o /home/simd/dotProduct.dll
/home/apachelucene/lucene/misc/src/c/dotProduct.c
```
```c
// dotProduct.c
int32_t dot8s(int8_t vec1[], int8_t vec2[], int32_t limit) {
// dot product impl
}
```
- **Test** if everything works and dot product implementation is correct
```sh
./gradlew test // PASSES, since by default
native dot product is not testes
./gradlew test -Ptest.native.dotProduct=false // PASSES, switched off
./gradlew test \
-Ptest.native.dotProduct=true \
-Ptests.jvmargs="-Djava.library.path=/home/simd" // PASSES
./gradlew test -Ptest.native.dotProduct=true // FAILS, needs library to be
linked
```
- **Benchmark** against the other C implementation or Panama
```sh
java --enable-native-access=ALL-UNNAMED \
--enable-preview \
-Djava.library.path="/home/simd" \
-jar
lucene/benchmark-jmh/build/benchmarks/lucene-benchmark-jmh-11.0.0-SNAPSHOT.jar \
regexp "binaryDotProductVector|dot8sNative"
```
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